124 ORIBATOIDEA SINENSIS I 



(visible only under special conditions) : anterior ones 

 elongate-ovate, lying along (half on each side of) anterior 

 edge of notogaster, slightly removed from posterior thoracic 

 apophyses which are short but prominent and decidedly 

 converging; posterior lateral oval, near the anterior areae 

 and posterior to them though slightly ventrad; posterior 

 mesial elongate-oval, very near posterior margin; tracheal 

 foramina as in figure 1. There seems to be considerable 

 variation in relative position of those about the mesonotal 

 areae porosae. This difference in relative position does not 

 seem to be entirely due to angle of perspective. Judging 

 from those seen on the posterior margin of the notogaster, 

 they seem to be lodged in shallow saucer-like depressions 

 and consist of a minute nipple in the center of the depres- 

 sion. None of them bear hairs. 



Pteromorphae normal, broadly rounded anteriorly, the 

 anterior pivot broad, curved, beak-like; outer edge with 

 a sinuous notch opposite the groove, posterior edge broadly 

 curved, the posterior angle abrupt, somewhat more than 

 a right angle, inner edge sinuous; nervures frequent, linear, 

 crenulate; groove wide, straight (though appearing curved 

 in to to mounts) bordered on each side though more espec- 

 ially anteriorly by a heavily chitinized band making the 

 groove definite and band-like, extending more than half 

 way to lateral edge of pteromorphae ; a foramen in the 

 center of the anterior band with a fine, serpentine groove 

 running from it towards the base. 



Ventral plate (fig. 2) relatively flat, the anterior half 

 finely granular (the posterior edge of this granular area 

 is indicated in the figure by the broken line running between 

 the leg-cases and the genital and anal apertures) ; anterior 

 edge sinuous, limited anteriorly by lamello-tectopedial band; 

 leg-cases rectangular ventro-posteriorly, with rounded corners 

 extending far ventrally, the ventral plate laterally depressed 

 so as to entirely house the pteromorphae limited anteriorly, 

 by lamello-tectopedial band, the antero-dorsal corner pro- 

 duced in the form of a small triangle unoler the notogaster ; 

 genital covers small, narrowing posteriorly, each with three 

 pores almost in a line; anal covers large, very slightly less 

 than their own length from genital covers, strongly tapering 

 anteriorly, anterior corners very much rounded off, posterior 

 edge decidedly rounded laterally, two pores on each cover 

 and a short " slit " on each side of aperture at the center; 

 other foramina as indicated in the figure, in no case was 

 it possible to see hairs arising from any of the ' ' pores ' : 

 on the ventral plate. 



